Checking mechanism for doors



Sept. 30, 1952 w, CARLSQN r -2,611,919

CHECKIIQG MECHANISM FOR DOORS Filed Dec. 1, 1950 2 SI-IEETISQSX-IEET 1 amzam 'IIIIJ 0511/11/11! Enpch mm ,9 INVENZ'QR.

Sept. 30, 1952 E, w. 'cARLsoN' 2,611,919

CHECKING MECHANISM FORRDOORS Filed D 90. 1, 1950 v 2|SHEETS-SHEET 2 Fig.3

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Patented Sept. 30, 19 2 I UNITED STATES PATENT car es I I 2,611,919 I v:

' panorama; MECHANISM'FOR DOORS EnochwiGailson, Jamestown, N. 1 j Application mant 1, 1950, Serial No. 198;64'3

The present invention relates to improvements in checking mechanisms for doors and' more par ticularly to a checking mechanism which is adapted to control the swinging movement of a swinging door whereby the swinging door maybe heldin its-open position-after the doo'r'has been swung through at least 85 and wherein means are provided for controlling the closing movement of the door, initial-movement'- of the 'd'oor bein'grestricted by a pair of fluid flow passages having. adjustable valve means; and-the iin'al stages of movement of the door being substan-- tially slowed by the restrictednow of fluid through oneo'f the fluid flowpassages.

An object of the present inventionis to provide an improved checking mechanismior doors which may be manufactured as a single unit'- to beinserted into a door. for rotatably supporting the door on a cam surfaced rod. i Y

A furthervobje'ct of the'inventionzis to provide a checking mechanism having a i housing and a pair of recip'rocable pistons mounted therein and interconnected for simultaneous" movement and wherein a first piston is axially moved. upon pivoting of the door 2 and engagement with the cam surfaced rod while the return movement of the piston is controlled by .fiuid flow around-the secondpiston. r v

A still further objector" the present invention is to provide a pair .ofiiuid flowfpassa'ges. past the second piston in thesecond' bore with ads" justable valves for controlling the flow through the-passages and wherein a first passagexo'pens' communication with? an intermediate end portion of thesecond wall while'thewsecond passage opens communication with an endpcprtion. of ther'second bore-wherebymovementof the. second:

gagement with the first piston whereby. when the door has been moved throughat'least- 85;

the cam surface in engagement with the end. portion of thefirstpiston will maintain the door in its open position Various other objectsand advantageswill come apparent fromthedetailed descriptionsv'to; follow.- Thevbestiorm inwhichI havecontem plated applying myinvention is ;.clearly; illus trated in the accompanying drawings,- wherein;

Figure 1 is aside elevational' view showing thechecking mechanism of 1 the present invention mounted in a door with parts in section;

Figure 2 is a horizontal longitudinal sectional view taken substantially along the-plane-of line 22 of Figure l; 1

Figure 3 is a vertical longitudinal sectional view of the'checkingmechanism of Figure 1;

Figure 4 is a vertical transverse sectional View taken substantially along the'plane of line 4''-4 of Figure 3; I a

Figure 5 is an inner end elevational view of the checking mechanism;

Figure 6 is an outer end elevational view of the checkingmechanism;

Figure '7 is an enlarged detailed s'ectional'view through the second piston showing the ball check valve. therein; i

Figure 8 is a detailed sectional view showing a-por-tionof the checking mechanism in an open position after the door has been moved'ove'r 90;

Figure 5) is a view similar to Figure 8 but where in thedoor has been moved a minimum of 85;

Figure 10 is a detailed elevationalview showing a pair of swingingdoors each being provided with 'a checkingmechanism of the present in ve'ntion; and .v

' Figure .11 is a top plan view looking down'on the'means for non-rotatabl'y supporting the cam surfaced .rod. v

Referring more particularly to the drawings; wherein like numerals designate like parts throughout, the numeral 10 designates generally the housing for thedoorchecking mechanism; thenumeral l2 designates igenerallyvthe means for non-rotatably supporting the camsurfa'ced rod while the numeral [4 designates generally I the camsurfaced rod or shaft whichlrotatably:

supports the checking mechanism housing; The numeral l6" designates generally the piston means for controlling the movement of the checking mechanism while the numeral IB designates generally the fluid control means" for:

the'pistonmeans l6. v v

The housing in is :of steppe'd' construction hav ing a first portion 20-, a second portion22: and" a third portion 24. "The second portion 22 and= third portion. Mare longitudinally-bored air--21; and 28 to provide a pair of parallel'firs't and second bores in the housing 10. The wall30 between the pair of bores 26 and 28 is formed withasslot 32 through which a screw. 34 maytbe.:

extended'for movement insaid slot: for a'purpos'e:

presently seen. The bores 26 and'zfl'aareiclosed} at their-innerends and have their-open outerends removably closed; by the closure-3 plugs 36" and;; 38 which are threadedlyengaged in the threaded portions V m-and 4,2 of jsaidiboresi A first piston 44 is reciprocably disposed in the first bore 26 while a second piston 46 is reciprocably disposed in the second bore 28 with the screw 34 interconnecting the first and second pistons for simultaneous movement. A resilient means comprising a spring 48 is positioned in the first bore 26 for normally urging the first piston 44 to the position shown in Figure 3 while the longitudinal movement of the second piston 46 is controlled by fluid flow means I8.

The fluid flow means I8 comprises a pair of passages 50 and 52 which are longitudinally situated in the housing I and provide communication between the chamber 54 and chamber 56 at opposite ends of the piston 46. The first passage has a downwardly extending passage 58 which communicates with an intermediate portion of the chamber 56 while the passage 52 has a downwardly extending passage 60 in communication with the outer end portion of the chamber 56 whereby longitudinal movement of the piston 46 will first close communication through the passage 58 and then through the passage 69 for a purpose to be hereinafter described.

The housing II] is also provided with a pair of longitudinal bores 62 and 64 which are in axial alignment with the bores 52 and 56. Interiorly and exteriorly threaded bushings 66 are engaged in the bores 62 and 64 for adjustably supporting the pair of control valves I0 and I2, the valves l0 and I2 being adapted to cooperate with the tapered valve seats I4 and 16 for controlling the flow through the passages 50 and 52.

The housing Ill is provided with an access opening closed by the closure plug I8, the opening being provided for filling the fluid system of the checking mechanism.

The entire housing I0 is encased in metallic sheathing 8D and secured within a recess formed in the door D by means of screws inserted through the openings 82 in the first portion 28 of the housing.

A perpendicularly extending bore 84 is in communication with the bore 26 at one end thereof and has a roller truck bearing 86 disposed in the upper end thereof. The bearing sleeve 88 is fixed within the bore 84 adjacent the lower end thereof and a cam surfaced rod 96 is disposed within the bore 84 for rotatably supporting the housing I0 and door D. The cam surfaced rod 90 is formed with an annular flange at 92 for engagement with the truck bearing 86 and has a concentric portion 94 formed with a cam surface 66 for engagement with the recessed portion 98 of the first piston 44. The lower end of the rod 96 is formed with a reduced bearing portion for rotatably engaging the bearing sleeve 88. The lowermost end portion of the rod 96 is formed with flattened lateral faces I00 for a purpose to be hereinafter described.

The cam surfaced rod 90, looking at Figures 8 and 9, is formed with the cam surface 96 which has a radius of curvature substantially equal to the radius of curvature of the cam surfaced portion 94 and the cross sectional area of the cam surfaced portion 94 is equal to less than one-half of the area of the cam surfaced portion 94 had it been completely circular and not of reduced cross section.

The means I2 for non-rotatably supporting the cam surfaced rod 90 includes a. plate I02 which is secured within the recess I04 formed within the threshold element I06 of the frame of the doorway. Of course, screws I68 and III] may be employed for securing the plate 02 within the recess. The plate I62 is formed with an opening H2 for receiving the bearing bushing II4 having a non-circular opening II6 therein for receiving the lowermost end portion of the cam surfaced rod 90 therein. A transversely extending pair of screws I I8 are engaged with the bearing bushing I I4 for non-rotatably securing the same to the plate I02.

Looking now at Figure 7, it will be seen that the second piston 46 is provided with a longitudinally extending bore I 28 having an enlarged bore portion I22 in communication with the chamber 56. A ball check valve I24 permits fluid flow in one direction through the second piston 46 during reciprocation thereof.

In view of the foregoing description, taken in conjunction with the drawings, it is believed that a device has been provided which will accomplish all of the objects hereinabove set forth. From a consideration of Figures 2 and 3, it will be seen that pivoting movement of the door will effect fluid flow through the longitudinal bore in the second piston 46 past the check valve I24 until the door reaches its open position, due to the camming action of the cam rod 96 against the first piston 44. Assoon as the door passes approximately of movement, engagement between the piston 44 and the cam surfaced portion 94 of the cam rod will maintain the door in its open position. The closing movement of the door is limited by the flow of fluid through the passages 50 and 52. When the piston 46 reaches the position shown in Figure 3, the flow through the first passage 50 will be stopped thereby slowing the closing movement of the door during the latter stages of movement. The valves I6 and I2 may be threadedly adjusted for further controllingthe initial and final closing action of the door.

Having described the invention, what is claimed as new is:

1. A door check comprising a housing disposed in a door and having a pair of substantially parallel first and second bores therein, first and second pistons reciprocably disposed in said first and second bores, respectively, the wall between said bores being provided with a slot and means extending through said slot and connecting said pistons for simultaneous movement, resilient means in said first bore and normally urging said first piston to a first position, a cam surfaced rod perpendicularly disposed relative to said first piston and rotatably supporting said housing, the cam surface of said rod being engaged with the adjacent end of said first piston, and fluid control means for said second piston controlling fluid flow past said second piston whereby when the door is opened the pistons will move to a second position and when the door is released the fluid control means will control the movement of said pistons back to the first position and thereby effect controlled movement of said door, said fluid control means including a pair of passages in said housing connecting the chambers at opposite ends of said second piston, and valve means for adjustably' controlling the flow through said passages, one of said passages communicating with said second bore at an intermediate portion thereof, and a second passage communicating with an end portion of said second bore whereby movement of said second piston toward said end portion will first close communication through said one passage thereby eflecting a slowed passage of fluid from one end of said second bore to the other end thereof whereby the closing movement of the door will be slowed during the latter stages thereof.

2. A door check comprising a housing disposed 5 in a door and having a pair of substantially parallel first and second bores therein, first and second pistons reciprocably disposed in said first and second bores, respectively, the wall between said bores being provided with a slot and means extending through said slot and connecting said pistons for simultaneous movement, resilient means in said first bore and normally urging said first piston to a first position, a cam surfaced rod perpendicularly disposed relative to said first piston and rotatably supporting said housing, the cam surface of said rod being engaged with the adjacent end of said first piston, and fluid control means for said second piston controlling fluid flow past said second piston whereby when the door is opened the pistons will move to a second position and when the door is released the fluid control means will control the movement of said pistons back to the first position and thereby efiect controlled movement of said door, said fluid control means including a pair of passages in said housing connecting the chambers at opposite ends of said second piston, and-valve means for adjustably controlling the flow through said passages, one of said passages communicating with said second bore at an intermediate portion thereof, and a second passage communicating with an end portion of said second bore whereby movement of said second piston toward said end portion will first close communication through said one passage thereby effecting a slowed passage of fluid from one end of said second bore to the other end thereof whereby the closing movement of the door will be slowed during the later stages thereof, said second piston being formed with a longitudinal passage interconnecting the chambers at opposite ends of said second bore, and a ball check valve in said last recited passage for controlling the fluid flow for flow through said second piston only during opening movement of the door.

ENOCH W. CARLSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 993,874 Regan May 30, 1911 1,975,430 Mitchell Oct. 2, 1934 

